Method of and apparatus for making bags and the like



A. POTDEVI N July 20, 1937.

METHOD OF AND APPARATUS FOR MAKING BAGS AND THE LIKE Fil ed Oct. 10, 1934 I IN V EN TOR.

Patented July 20, 1937 UNITED STATES PATENT OFFICE Adolph Potdevin, Garden .City, N. Y., assignor to Potdevin Machine Company, N. Y., a corporation of New York Brooklyn,

Application October 10, 1934, Serial No. 747,681

14 Claims.

in superimposed relation, the opposite edges of one web being folded over the edges of the other web and pasted or otherwise secured thereto.

In the drawing accompanying this application:

Fig. 1 is a plan view diagrammatically illustrating the various stages in the handling of the web;

Fig. 2 is a plan view of the first step of bottoming the bag;

Fig. 3 is a plan view of a finished bag;

Fig. 4 is a sectional view on the line 4-4 of Fig. 3;

Fig. 5 is a sectional view on the line 3-5 of Fig. 3;

Fig. 6 is a sectional view of a modified form of bag; and

Fig. 7 diagrammatically illustrates the machine for the making of the bag.

Referring to the drawing in detail, the materials for making the bag are taken from two supply rolls I and 2. The web of material from the roll I is designated 3, and as it leaves the supply roll I, traveling in the direction of the arrow thereon, it passes around idler roller 4 and then through the edge folding mechanism 5 by which the opposite edges of the web are turned inwardly as shown at 6 to crease the web adjacent its edges, as shown at 6' in Fig. l. The web next passes between rollers 1 where the edges of the web are spread outwardly again, so that the web is ag'ainin a flat condition, and between two cutters 8 on opposite sides of the machine which cut a section out of one side of the web, the cutout being shown in Fig. 1 at 9 and ID, for instance.

The cutters 8 are rotatable about axes parallel to the travel of the web.

The web continues to advance between rollers I and I2 and about a roller l3 which is located adjacent the gluing mechanism. This gluing mechanism is diagrammatically illustrated, and comprises glue pot l4, glue roller l5 and glue applying roller IS, the latter being adapted to apply glue, paste or other suitable adhesive along the edges of the paper as shown at H and I8, so that when the opposite edges 6 of the web are again folded over along the creases 6' the glue or other adhesive will be on the underside thereof. The gluing roller I6 is also adapted to apply adhesive l9 transversely of the paper as seen in Fig. 1.

. The Web 2| from the supply roll 2 is slightly narrower than the web 3 and passes between forwarding rollers 22 past cut ofi mechanism 23 by which it is cut off into sections 2|, and through a series of forwarding rollers 24 to superimposed position with respect to the web 3 between roller I3 and the brush roller 20. The peripheral speed of the forwarding rollers 24 is the same as the linear speed of the web 3, the web sections 2 l are deposited in spaced relation upon the web 3 between consecutive sets of'notches 9 and Ill. The speed of the feed rollers 22 can be varied relatively to the operation of cut-on mechanism 23 to vary the length of the web sections 2|.

The roller 20, as will be understood, is the width of the web 2| or, in any event, narrower than the distance between the strips of adhesive H and I8 and is for Wiping the web sections 2| upon web 3 so as to insure the two being attached to each other by the adhesive I9. In practice this mechanism is all properly timed so that the cut-off mechanism 23 will cut the web 2| into proper lengths depending, of course, upon the length of the bag being made.

As the web sections 2| and web 3 in superimposed relation pass between the rollers I3 and 20 the edges of the web 3 will be engaged by edge-folding mechanism, diagrammatically illustrated at 25, which is adapted again to fold the opposite edges 6 of the web 3 along the creases 6' over upon the web sections 2|, as shown at 26 in Fig. l. Inasmuch as these edges have already had adhesive applied thereto it will be apparent that the Web sections 2| and the web 3 now will be attached to each other in superimposed relation with the edges of the web 3 turned over and enveloping the edges of the web sections 2|.

The material continues its forward advance to and between a pair of rollers 21 and a pair of rollers 23 to cut-off mechanism 29 where the web 3 is severed transversely midway of the notches 9 and I0 into bag lengths provided with end flaps 32 and 33 in the lower wall of the, assembly, as viewed in Fig. 1, the web being held taut during the cutting off or severing operation by rollers 3|]. 1

The partially completed bag designated 3| in Fig. 1 next is advanced to between upper roller 35 and lower roller 36. The roller 35 rotates in gages this depressed portion of the traveling material and squeezes the same against the abutment 38 soas to insure thorough creasing along the line 39 of Fig. 2. The clamp 4|! is controlled by a stationary cam 4|.

As the blade 31 finishes its function the gluing blade 42 which is carried on the periphery of the roller 35 and which picks up adhesive from roller 43 engages the upper face of the bag length 3| back of the crease 39 to apply adhesive across the face of the member 3|, as shown at 44 in Fig. 2. The creasing of the leading end of the length 3| by the members 31 and 36 will cause the'leading end of the bag length 3| to stand upwardly at an angle to the plane of the bag length so that when this end of the bag length passes the roller 45 the flap 33 and a short length of the leading end of the web section 2| will be folded over, as illustrated. in Fig. 3, to bring the underside of the flap 33 upon the adhesive 44 thereby to bottom the bag. The bottomed bag then passes between a pair of rollers 46 and 41 which may be resiliently mounted, one of these rollers carrying a pressure bar 48 adapted to engage the upper surface of the bag above the adhesive stripe 44 to insure thorough adherence of. the turned over flap of the lower roller 36, causing the bag length to be creased on its trailing end, as shown at 5| in Fig. 3, to crease the bag transversely at the edge of the trailing endof the web section 2|, to facilitate closing the flap 32 when the bag is in use.

The bag illustrated in Fig: 6 is made in the same way as the bag of Fig. 4, except that the leading end of the web section 2| is turned over slightly as shown at 52 in Fig. 4, whereas in Fig. 6 the end is not turned over in thebottoming operation.

It is to be understood that changes may be made in the details of construction and arrangement of parts above described within the spirit and scope of my invention.

What I claim is:

1. In apparatus of the class described, the combination of feed rollers for continuously advancing a flexible web or strip, feed rollers for continuously advancing sections of a second and narrower flexible web or strip in superimposed relation with respect to the first web or strip, one of said strips eventually constituting the continuously advancing sections of a second and narrower flexible web or strip in superimposed relation with respect to the first web or strip, means for applying adhesive adjacent the edges of one of said webs or strips,'folcling mechanism for folding the edges of the wider strip over and upon the superimposed sections of the narrower strip, so as to secure the two strips to each other, and severing means for severing the strip thus formed into bag lengths.

3. In apparatus of the class described, the combination of means for continuously advancing a flexible web or strip, paste-applying means for applying adhesive transversely of said strip, means for advancing a second and narrower flexible web or strip, severing mechanism for severing said narrower web into sections, means for advancing said sections in spaced relation into superimposed relation with respect to said wider strip, paste-applying means for applying stripesof adhesive along the edgesof one of said strips, means for imposing pressure upon the superimposed web section toward the said transversely pasted portion of the wider web or strip, a folding device for folding the edges of the wider strip over and upon the narrower web sections to secure the same thereto, and severing mechanism for severing the strip thus formed into bag lengths.

, 4. In apparatus of the class described, the combination of means for continuously advancing a flexible web or strip, paste-applying means for applying adhesiveito said strip transversely, means for advancing a second and narrower flexible web or strip, paste-applying means for applying stripes of adhesive along the edges of one of said strips, severing mechanism forsevering said narrower web into sections in spaced relation, means for advancing said sections into superimposed relation with respect to said wider strip, means for imposing pressure upon the superimposed web section toward the said transversely pasted portion of' the wider web or strip,

a folding device for folding the edges of the wider strip over and upon the narrower web sections to secure the same thereto and form a single walled tube, and severing mechanism for severing the tube thus'formed into bag lengths.

5. In apparatus of the class described, the

combination of means for advancing a flexible applying stripes of adhesive along the opposite edges of said strip, means for advancing a second and narrower web, severing mechanism for severing the narrower web into sections, forwarding means for forwarding said web sections in superimposed relation with respect to the first mentioned web between consecutive sets of notches, a folding device for folding the pasted edges of the wider web over and upon the superimposed narrower web sections, and severing mechanism for severing the widerweb transversely into bag lengths intermediate the ends of said notches.

6. In apparatus of the class described, the combination of means for advancing'a flexible web or strip, notching means for providing notches in said web, paste-applying means .for applying paste to the surface of said strip transversely thereof and for applying stripes of adhesive along the opposite edges of said strip, means for advancing a second and narrower web, severing mechanism for severing the narrower web into sections, forwarding means for forwarding said web sections in superimposed relation with respect to the first mentioned web between consecutive sets of notches, a folding device for folding the pasted edges of the wider web over and upon the superimposed narrower web sections, and severing mechanism for severing the wider web transversely into bag lengths intermediate the ends of said notches.

7. In apparatus of the class described, the combination of feeding mechanism for continuously advancing a web of bag material, mechanism for depositing and adhesively fastening strips of narrower material upon the said web in longitudinally spaced relation, pasting and folding mechanism for pasting the edges of the wider web and folding them over upon the face of the narrower strip, severing mechanism for severing the wider web transversely between adjacent narrower strips to provide bag lengths with a projecting flap at each end, creasing mechanism for creasing the leading end of the bag length to-the rear of the fiap at that end of the bag length, paste applying mechanism for applying paste to the face of the bag length to the rear of said crease, means for folding the flap at the leading end of the bag length over upon said pasted area to bottom the bag, and creasing means for creasing the trailing end of the bag length at the base of the fiap at that end of the bag length.

8. In the making of bags and the like, the method which comprises continuously advancing a web of bag material,imposing strips of narrower bag material in spaced relation upon the first mentioned web, applying paste to the edges of one of said strips, and folding the edges of the first mentioned web over and upon the said strips to secure the edges of both strips'to each' other and form a single walled tube of bag material.

9. In the making of bags and the like, the methodwhich comprises notch ing the edges of an advancing web of bag material, applying paste to the body of the web and to the edges of the web, imposing strips of narrower bag material upon said web between said notches to be attached thereto by the first mentioned paste, folding the pasted edges of the 'wider web over upon the said strips, severing the-said web intermediate the adjacent ends of said strips to provide bag lengths with a projecting flap at each end, and finally folding the fiap at one end of the bag length over upon the adjacent end of the strip and pasting it down to bottom the -10. In the making of bags and the like, the

method which comprises notching the edges of an advancing web of bag material, applying paste to ,the unnotched edges of the web, between the notches imposing strips of narrower bag material upon said web at each side of said notches, and securing the leading edge of the narrower strips to the web, folding the pasted edges of the wider web over upon thesaid strips, severing the said web intermediate the adjacent ends of saidstrips, to provide bag lengths with a projecting flap at eachend, advancing the bag lengths,

on their advance applying paste to the superimposed strip adjacent the leading end thereof, f

creasing the bag length adjacent the base of the flap at the leading end of the bag length, folding this fiap along the crease over upon the pasted area of the superimposed strip to bottom the bag, and finally creasing the bag length adjacent the base of the fiap at the trailing end of the bag length.

11. The method which comprises folding over the side edges of a strip of bag material, unfolding said edges, notching said unfolded edges at predetermined intervals, applying adhesive to said unfolded edges as well as transversely of the strip, severing an advancing strip of narrower material into sections at regular-predetermined intervals, feeding said severed strip sections in; superimposed relation to the wider strip and adhesively fastening the leading end of the narrower strip sections to the wider strip at regular intervals between the notches of the wider strip by said transverse adhesive.

12. The method which comprises folding the pasted edges of a web of bag material over the edges of narrower and shorter strips disposed thereon in spaced relation, severing the wider and longer web into bag lengths between the.

equally disposed narrower strips and folding. the leading end of thewider web including the leading edge of the narrow strip edges adhesively secured thereto against the pasted face of the narrow strip section to form the bottom of the bag.

13. In the making of bags and the like, the method which comprises notching the edges of an advancing web of bag material, applying paste to the unnotched web, imposing spaced strips of narrower bag material upon said web at each side of the notches, and securing the leading end of to bottom the bag and finally creasing the bag length adjacent the base of the fiap at the other end of i the bag length. I,

14. In the making of bags and the like, the method which comprises'advancing bag material in the web, imposing strips of narrower material in spaced relation upon the first mentioned web, applying paste transversely to the face of one of said materials before the two are superimposed, applying paste to the edges of one of said materials, and folding the edges of the web over and upon the said narrower strips to secure the edges of the two materials to each-other to form a single walled tube. J

' 'ADOLPH PO'I'DEVIN. 

